FREE CHARGE TELEPHONE SYSTEM, LINE CONTROL SYSTEM, AND TERMINAL TELEPHONE

摘要

PROBLEM TO BE SOLVED: To make telephone charge free. SOLUTION: In a line connection, a general telephone 2 joined in a public telephone network 1 is connected through a line controller 3 to a terminal telephone 5 joined in a private telephone network 4. An advertisement information provided from a sponsor 9 in addition to the voice information is sent to the terminal telephone 5 to obtain the fee of advertisement while the fee is used as a communication cost, and then the free charge telephone system is realized.